High-pressure boiler for traction use and other uses



` 3 SHEETS-SHEET lf V T. J. MCDONALD.

Patented May 3U, 1922.

APPL`ICATI'ON FILED DE()l 7| 1920.

.7: /./V 1 i-, Y u. 311 z vHIGH PRESSURE BOILER FOR TRACTION USE AND OTHER USE-S..

I y Bawag @.HW 551* l 1mm w lT. J. VICDONALD.

lHIGH PRESSURE Boum Foa TRAcTloN use ANDIOTHER usEs.

APPLICATION FILED DEC. 7| 1920. 4 v 1,417,615, Patented May 30, 1922.

3 SHEETS-SHEET 2.

T. 1. MCDQNALD. HIGH PRESSURE BOILER FOR TRACTION USE'AND OTHER USES.

.2 9 l 0,7 90 W M d nu :TU n .mw na D1 A 5 1 6 N( l 4 I,

3 sHEETs-sVHEET s.

MTA/553:* y; f 333%' Mfg pressure service.

UNITED STATES PATENT OFFICE.

THOMAS J'. MGDONALD, OF KNOXVILL, TENNESSEE.

Specification of Letters Patent.

Patented May 3o, 1922.

Application led December 7, 1920. Serial No. 428,906.

To all whom z may concern:

Be it known'that I, THOMAS J. MCDONALD,

a citizen of the United States, residing at.

ments in steam boilers and has for its ob-- ject to provide a portable boiler for high The particular embodi-` ment of the invention hereinafter more specifically described is adapted for use with tractors employed for moving loads, propellin agricultural implements, etc.

he improved boiler is somewhat similar in construction to boilers that have been proposed or employed for marine use, including an interior combustion chamber which is surrounded,to a considerable extent, by a water and steam chamber. Animportant feature of the invention is the location of a superheater so that it will not be subjected to excessive temperatures, and lproviding means whereby a suflicient amount of water to prevent injury of said superheater when starting the boiler will be automatically sup- 'plied at the close of any period of service,

or when the generation of steam by the boiler ceases. Y

In the accompanying drawings Fig. 1 is a vertical longitudinal section through a boiler embodying the invention, the section being taken substantially on the line urzof Fig. 2.

Fig. 2 is a front elevation with the end casing plate or boiler head removed, and

Fig. 3g is a view similar to Fig. 1, illus-` trating a slight modification.

Referring to the drawings, in the several figures of which like reference characters designate corresponding parts, the bodyrof the boiler consists of a metal shell which is welded or drawn into suitable cup, formation to provide an annular wall 1 and a head 2. A second head 3 is secured within the open end of said shell by welding or other suitable means, thus forming a very strong and durable unit. Within suitable apertures formed in the heads 2, 3 is secured a tube 4, and said heads are further connected by ay series of tubes or flues 5 that-extend above and around the greater portion of said tube 4, which latter separates the steam and water space from the combustion chamber.

The tube 4 forms the outer wall of the combustion chamber ofthe boiler which, in the embodiment of the invention illustrated 1n Figs. l and 2, is provided-with a lining 6 of suitable refractory material, such, for example, as alundum, crystolon or carborundum, which lining is separated from the metal tube 4 by a suitable insulating material 7, as asbestos for example.

The body of the boiler before referred to is provided with suitableextensions 8, 9 which have heads 10, 11 at their outer ends. The combustion chamber is extended across the space between the iue sheet 2 and the front head 10 and within the rear extension 9 is arranged a body 12 of refractory material in which is formed a chamber 13, that constitutes a portion of the combustion chamber and into which the rear ends of the tubes or iiues 5 open.

A stack 14 is connected with thechamber between the front Hue sheet 2 and the boiler head 10, and within said chamber is arranged a 'superheater which, as shown, comprises two coils 15 connected at their lower ends and having their upper ends, respectively, connected to a steam supply pipe 16 and aA delivery pipel 17. The steam supply pipe 16 extends into the steam space Within the boiler and is there provided with a suitable collecting head 16a.

Water is supplied to the boiler through feed pipes 19 that extend through the wall 1, and each having within the steam and water chamber of the boiler a longitudinally extending, perforated, branch 20.

Arranged within the upper portion of the steam space of the boiler is a condensed steam bafie or collector .21. As shown,lthis collectorffis preferably made in the form of a relatively shallow. pan which is inclined longitudinally downward from its rear end to the front fluesheet 2, and the bottom of which is provided by two oppositely inclined sectionsvl This baiiie or collector is supported adjacent the top walls of the steam space and whenever the generation of steam is discontinued, or a period of service of the boiler terminated, a relatively small amount of 105 steam vwill be condensed and collected in or a pocket-like member that connects the 11@ two coil elements so that any water which is collected in the collector 2l will be vc011- iveyed directly to the loiver end ofthe superheater coil.

The members are so proportioned that the 'amountof Water which is thus supplied to the superheater at the end of each period of service of ythe boiler Will be sutlicient to prevent the coils 15 being injured when the boilergis again put into service, and yet will not be sufficient to do any injury to the engine connected with the outlet pipe 17 in case it is carried over thereinto.

Any suitable heating means may be employed, a fluid fuel injecting nozzle 23 being conventionally illustrated for this purpose.

The embodiment of the invention illustrated in Fig. 3 diifersbut slightly from that shown in Figs. 1 and 2. In the modified form the combustion chamber is not provided With a refractory lining throughout its entire length, but has such lining 24 adjacent its outer end only, the body of the chamber between the flue sheets, 2, 3 beingformed by a corrugated metal tube 4a. The arrangement of the superheater and means for supplying Water thereto are the same as in the form illustrated in Figs. 1 and 2.

It-is thought that the operation and advantages of the invention will be readily appreciated from the foregoing description in connection with the drawings. It will be seen that the construction illustrated provides means by which a maximum amount of heat will be transmitted to the water. By providing perforations the feed Water pipes 20 so that such Water is directed downward, circulation of water is promoted and steam to the desired pressure may be very rapidly generated. The superlieater being, at all times, in connection with the collector 21 insures that a suitable quantity of water will be supplied thereto at the end of each period of service of the boiler so that danger of damage to the superheater is avoided.

Having thus described my invention what I claim is:

1. The combination with a steam boiler and a superheater, of means for automatically supplying to the superheater, when the boiler ceases to generate steam, sufiicient Water to prevent injury to the superheater when the boiler is again put into operation, the amount of such Water being insufficient to do any injury to an engine connected with the boiler 4in case it is forced thereinto.

2. The combination with a steam boiler, of a superheater .coil connected with the steam space in the boiler, and means for automatically supplying a small amount of Water to the superheater coil when the boiler ceases to generate steam.

3. lThe combination with a steam boiler,`

of a superheater connected with the steam space in the boiler, means for collecting water of condensation in the upper part of the steam space of the boiler, and a Conduit for conducting such water to the superheater, for the purpose described.

4. The combination with a steam boiler, of a superheater coil having one end connected with the steam space in the boiler, a collector for condensed steam in the upper portion of the steam space of the boiler, and a conduit connecting said collector With the superheater coil, for the purpose described.

5. The combination with ay steam boiler, of a Superheater connected with the steam space in the boiler, a collector for condensed steam suspended from the boiler shell in the upper part of the steam space, and a conduit connecting said collector andthe superheater, for the purpose described.

6. The combination Wit-h a return flue steam boiler, of a superheater arranged Within a chamber at one end ofthe boiler flues, means for conducting steam from the boiler to the superheater, means Within the steam space of the boiler for collecting a yrelatively small amount of condensed steam therein, when the boiler ceases to generate steam, and a conduit for conducting such condensed steam tothe superheater.

7. A steam boiler comprising a shell having an interior combustion chamber and a steam and water chamber, a series of flues extending through the steam and Water chamber and communicating with the combustion chamber, a superheater arranged to be heated by products of combustion from the combustion chamber and connected With the upper portion of the steam and Water chamber, and independent means for conducting a portion of the Water condensed steam in the steam and Water chamber, `when the boiler ceases to generate steam, to the superheater, for the purpose described.

8. A steam boiler comprising a casing provided with a combustion chamber, a stack chamber and a steam and Water chamber, a series of flues extending through the steam and Water chamber between the combustion chamber and the stack chamber, a superheater coil within the stack chamber communicating with the steam space of lthe steam and Water chambei, means in the upper portion of the last said chamber forv collecting a portion of the condensed steam therein when the boiler ceases to generate steam, and means for conducting the Water of condensation so collected to the superheater coil, for the purpose described.

9. The combination with a return flue steam boiler, of a superheater comprising a vertically 'extending coil arranged adjacent the outlets of the boiler flues, connections between the inlet end of said coil and the steam space of the boiler, means within the upper portion of the steam space of the boiler for collecting a portion of the steam condensed when the boiler ceases to generate steam, and a conduit connecting the lower end of the superheater coil and said collecta shell or casing interiorly "divided by two transversely extending Hue sheets, a combustion chamber extending through the front end of the casing or shell and through both flue sheets, said chamber having an enlarged section in rear of the rear flue sheet, a stack connected with the space between the front flue sheet and the adjacent end of the casing, flues mounted in the flue sheets outside the combustion chamber, a superheater arranged above the combustion chamber in the space between the front flue sheet and the front end of the casing, 'connections betweenvthe steam space of the boiler and the superheater, and means for automatically supplying a limited amount' of water to the superheater when the generation of steam in the boiler ceases, for the purpose described.

In testimony whereof I have hereunto set m hand. y THOMAS J. MODONALD. y 

